Re: [Libguestfs] [PATCH nbdkit v2 1/4] common/include: Add function for subtracting struct timeval.

--- common/include/test-tvdiff.c | 75 +++++++++++++++++++++++++++++------- common/include/tvdiff.h | 13 ++++++- 2 files changed, 74 insertions(+), 14 deletions(-)

int -main (void) +main (int argc, char *argv[])

+++ b/common/include/tvdiff.h @@ -40,7 +40,7 @@ #include <sys/time.h> /* Return the number of µs (microseconds) in y - x. */ -static int64_t +static inline int64_t tvdiff_usec (const struct timeval *x, const struct timeval *y) { int64_t usec; @@ -50,4 +50,15 @@ tvdiff_usec (const struct timeval *x, const struct timeval *y) return usec; } +/* Return timeval difference as another struct timeval. z = y - x. */ +static inline void +subtract_timeval (const struct timeval *x, const struct timeval *y, + struct timeval *z) +{ + int64_t usec = tvdiff_usec (x, y); + + z->tv_sec = usec / 1000000; + z->tv_usec = usec % 1000000; +} + #endif /* NBDKIT_TVDIFF_H */